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Mark,
I did some additional reading in the rotary book I
recommended to you and a bit more head scratching on exhaust
systems.
I modified the tube length formula I used
earlier to compensate for the fact the rotary puts out two exhaust pulses per
port per 720 deg cycle compared to 1 for the piston engine. This in effect
halved the length of tube needed to get the same scavenging effect.
Also using the recommended rotary book values for
area of a rotary exhaust tube , I calculated the tube diameter which came
out to 1.8".
In any case, I have attached the spreadsheet with those
modifications
Ed
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